net/instaweb/rewriter/rewrite_driver_pool.cc

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */


#include "net/instaweb/rewriter/public/rewrite_driver_pool.h"

#include "net/instaweb/rewriter/public/rewrite_driver.h"
#include "pagespeed/kernel/base/stl_util.h"

namespace net_instaweb {

const int RewriteDriverPool::kMaxDriversInPool;

RewriteDriverPool::RewriteDriverPool() {}

RewriteDriverPool::~RewriteDriverPool() {
  STLDeleteElements(&drivers_);
}

RewriteDriver* RewriteDriverPool::PopDriver() {
  if (!drivers_.empty()) {
    RewriteDriver* driver = drivers_.back();
    drivers_.pop_back();
    return driver;
  }
  return NULL;
}

void RewriteDriverPool::RecycleDriver(RewriteDriver* driver) {
  if (drivers_.size() < kMaxDriversInPool) {
    drivers_.push_back(driver);
    driver->Clear();
  } else {
    delete driver;
  }
}

}  // namespace net_instaweb